Leo of Catania was an 8th-century Benedictine monk who served as the fifteenth bishop of Catania. Born in Ravenna, he later moved to Reggio Calabria, where he served as an archdeacon before being elected to lead the archdiocese in Sicily. Known as the Thaumaturge, or wonderworker, he was recognized for his deep concern for the impoverished and his courageous opposition to iconoclasm. During a period of imperial pressure, he sought refuge in the mountains before eventually returning to his see to continue fighting heresy.